# 1. Write all the factors of the following numbers : (a) 24      (b) 15           (c) 21           (d) 27       (e) 12 (f) 20       (g) 18           (h) 23           (i) 36

(a) 24 = 1 $\dpi{100} \times$ 24

= 2 $\dpi{100} \times$ 12

=  3 $\dpi{100} \times$ 8

= 4 $\dpi{100} \times$

Hence Factor of 24 = 1, 2, 3, 4, 6, 8, 12 and 24 itself.

(b) 15  = 1 $\dpi{100} \times$ 15

= 3  $\dpi{100} \times$

= 5  $\dpi{100} \times$  3

Hence factor of 15 = 1, 3, 5 and 15.

(c) 21 = 1 $\dpi{100} \times$ 21

=  3  $\dpi{100} \times$  7

=  7  $\dpi{100} \times$  3

Hence factor of 21 = 1, 3, 7 and 21.

(d) 27 = 1 $\dpi{100} \times$ 27

= 3 $\dpi{100} \times$

= 9 $\dpi{100} \times$

Hence Factor of 27 are 1, 3, 9 and 27.

(e) 12=1$\dpi{100} \times$12

=2$\dpi{100} \times$6

=3$\dpi{100} \times$4

=4$\dpi{100} \times$3

Hence Factors of 12 are 1,2,3,4,6, and 12
(f) 20 = 1 $\dpi{100} \times$ 20

= 2 $\dpi{100} \times$ 10

= 4  $\dpi{100} \times$  5

= 5  $\dpi{100} \times$  4

Hence Factors of 20 are 1, 2, 4, 5, 10, and 20.

(g) 18  = 1  $\dpi{100} \times$ 18

= 2  $\dpi{100} \times$  9

= 3  $\dpi{100} \times$ 6

Hence Factors of 18 are 1, 2, 3, 6, 9 and 18.

(h) 23 = 1 $\dpi{100} \times$ 23

= 23 $\dpi{100} \times$ 1

Hence factors of 23 are 1 and 23.

(i) 36 = 1 $\dpi{100} \times$ 36

= 2  $\dpi{100} \times$ 18

= 3 $\dpi{100} \times$ 12

= 4 $\dpi{100} \times$

= 6 $\dpi{100} \times$

Hence factors of 36 are 1, 2, 3, 4, 6, 9, 18 and 36.

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